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Search: id:A005542
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| A005542 |
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Numbers n such that 10*3^n - 1 is prime.
(Formerly M0589)
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+0
1
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| 1, 2, 3, 4, 8, 10, 14, 20, 22, 26, 30, 38, 39, 49, 54, 58, 70, 81, 84, 87, 102, 111, 140, 159, 207, 224, 328, 358, 360, 447, 484, 908, 1083, 1242, 1461, 1705, 4624, 5199, 7106, 8667, 11157
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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H. C. Williams and C. R. Zarnke, Some prime numbers of the forms 2*3^n+1 and 2*3^n-1, Math. Comp., 26 (1972), 995-998.
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MATHEMATICA
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Do[ If[ PrimeQ[ 10*3^n - 1], Print[n] ], {n, 1, 12901} ]
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PROGRAM
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(PARI) v=[ ]; for(n=1, 1900, if(isprime(10*3^n-1), v=concat(v, n), )); v
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CROSSREFS
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Sequence in context: A135772 A051783 A033083 this_sequence A037171 A127352 A114854
Adjacent sequences: A005539 A005540 A005541 this_sequence A005543 A005544 A005545
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KEYWORD
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hard,nonn
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AUTHOR
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njas
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 05 2001
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